Positioning device for scribing on front and back surfaces of steel plate

Abstract

The utility model discloses a positioning device for scribing on the front and back sides of a steel plate, and relates to the technical field of machining. The positioning device comprises a shell and a permanent magnet, the shell is made of a non-magnetic material, a containing cavity is formed in the shell, conical electrical soft iron is arranged on the two opposite sides of the shell respectively, the permanent magnet is rotationally arranged in the containing cavity, and a magnetic switch is rotationally connected to the outer wall of one side of the shell. The magnetic switch is fixedly connected with the permanent magnet through a rotating shaft and used for driving the permanent magnet to rotate in the containing cavity. The device disclosed by the utility model is simple and small in structure, easy to operate and carry, not easy to damage, high in measurement precision, low in operation requirement on an operator, free from environmental limitation during operation and free from damage to a measured object.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a positioning device for marking the front and back surfaces of a steel plate. Background Art

[0002] In order to ensure the accuracy during the processing of steel plates, it is necessary to use the steel plate as a symmetry plane and find positioning points on the front and back sides of the steel plate. However, in actual operation, due to the curling of the edge of the steel plate (flat steel), the obstruction of structural parts at the edge of the plate, or the formation of a closed three-dimensional space without a plate edge after welding, the tools used cannot use the plate edge as a positioning reference, that is, there is a problem that the structural steel plate cannot be positioned inward from the plate edge. At present, for the positioning points in the thickness direction of the same plate width plane on the front and back sides of the steel plate, the flame "baking point" method is usually used, that is, the flame focus of the oxyacetylene cutting torch is used to bake one side of the steel plate to form a reference point. After a flame burn mark appears on the surface of the non-flame contact side of the steel plate, the flame burn mark is used as a positioning point symmetrical to the reference point about the steel plate.

[0003] However, the above-mentioned flame "baking point" method is affected by factors such as the flame focus size, steel plate thickness, and operator skills during operation. Therefore, the positioning points found by this method have a large accuracy error and are difficult to become a reliable basis for positioning and marking. It will also burn the surface of the steel plate and there is a greater risk of heating and deformation of thin plate components. At the same time, the equipment needs to be connected to tools such as oxyacetylene cutting torches and rubber air pipes, which affects the operation, and the operating environment is restricted by fire monitoring and explosion-proof requirements. Utility Model Content

[0004] In view of the problems that the above-mentioned method of finding positioning points by flame "baking points" has large accuracy errors, steel plates will deform, and operation is greatly restricted by the environment, the utility model provides a positioning device for marking the front and back sides of steel plates.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A positioning device for marking the front and back sides of a steel plate comprises a shell and a permanent magnet. The shell is made of non-magnetic material and has a accommodating cavity inside. Two opposite sides of the shell each have a conical electrical soft iron. The permanent magnet is rotatably arranged in the accommodating cavity. A magnetic switch is rotatably connected to an outer wall of one side of the shell. The magnetic switch is fixedly connected to the permanent magnet via a rotating shaft, driving the permanent magnet to rotate in the accommodating cavity.

[0007] Furthermore, a cross positioning line is provided on the surface of the shell near each of the conical electrical soft irons, and each of the conical electrical soft irons is located at the intersection of the cross positioning lines.

[0008] Furthermore, each of the conical electrical soft irons includes a large end and a small end, the large end is located on the cavity wall of the accommodating cavity, and the small end is located at the center point of the shell surface.

[0009] Furthermore, the connection line between the two conical electrical soft irons is located in a plane formed by the rotation of the permanent magnets.

[0010] Furthermore, the shell is made of copper material.

[0011] Furthermore, the shell is in the shape of a right prism.

[0012] The beneficial effects of the utility model are as follows: the utility model has a simple and compact structure, is easy to operate and carry, is not easy to be damaged, has high measurement accuracy, has low operation requirements for operators, is not restricted by the environment during operation, and does not harm the measured object. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Shown is a schematic diagram of the structural principle of an implementation method of the utility model.

[0014] Figure 2 Shown Figure 1 Side view of .

[0015] Figure 3 Shown is a schematic diagram of the installation of the positioning device and the steel plate.

[0016] Figure 4 The figure shows the operation schematic diagram of the positioning device. DETAILED DESCRIPTION

[0017] The utility model discloses a positioning device for marking the front and back surfaces of a steel plate. An implementation mode of the utility model is specifically described below in conjunction with the accompanying drawings.

[0018] like Figure 1 As shown, a positioning device for marking the front and back surfaces of a steel plate includes a shell 1 and a permanent magnet 3. The shell 1 is in the shape of a right prism and is made of non-magnetic material. In this embodiment, the shell 1 is a cube and is made of copper. The interior of the shell 1 has a receiving cavity, and the permanent magnet 3 is adapted in the receiving cavity. The upper side wall and the lower side wall of the shell 1 each have a conical electrical soft iron 2. The conical electrical soft iron 2 includes a large end and a small end, the large end is located on the cavity wall of the receiving cavity, and the small end is located at the center point of the surface of the shell 1. A magnetic switch is rotatably connected to the other side walls of the shell 1 except the upper side surface and the lower side surface. The magnetic switch is fixedly connected to the permanent magnet 3 through a rotating shaft, driving the permanent magnet 3 to rotate in the receiving cavity.

[0019] Combination Figure 2 and Figure 3As shown, the upper and lower surfaces of the housing 1 are each marked with a cross positioning line 4, and the intersection of the cross positioning lines 4 is the center point of each surface. The connecting line between the two conical electrical soft irons 2 is located in the plane formed by the rotation of the permanent magnet 3.

[0020] like Figure 4 As shown, a method for measuring the marking of the front and back surfaces of a steel plate comprises the following steps: the first step is to determine a suitable reference point on one side surface of the steel plate 5, and to draw a cross line 6 with the reference point as the center. The second step is to place the positioning device on the reference point, to fit the upper side surface of the housing 1 closely to the side surface of the steel plate 5, and to align the cross positioning line 4 with the cross line 6, and to make the intersection of the cross positioning line 4 coincide with the intersection of the cross line 6. The operator can directly observe the coincidence from the lower side surface of the housing 1, thereby improving the convenience and accuracy of the measurement. The third step is to find the area of ​​the positioning point on the other side surface of the steel plate 5, the positioning point and the reference point are symmetrical about the steel plate 5, and then turn the magnetic switch to the on position, the magnetic switch drives the permanent magnet 3 to rotate through the rotating shaft, so that the permanent magnet 3 is aligned with the conical electrical soft iron 2, and the permanent magnet 3 releases magnetism to the steel plate 5 through the conical electrical soft iron 2. The fourth step is to use the magnetometer 7 in the area where the positioning point is located, and find the maximum magnetic intensity point in the area where the positioning point is located through the magnetic intensity probe 701 of the magnetometer 7. Alternatively, a ferromagnetic steel ball 8 is placed in the area where the positioning point is located, so that the steel ball 8 can roll freely. After the steel ball 8 is stationary in the area where the positioning point is located, the stationary point of the steel ball 8 is the maximum magnetic intensity point. The fifth step is to mark the position of the maximum magnetic intensity point on the other side of the steel plate 5, and the marked point is the positioning point, thereby completing the measurement.

[0021] It should be noted that the method of measuring the maximum magnetic intensity point of the steel plate 5 by a rolling ferromagnetic steel ball 8 has the highest detection accuracy when the steel plate 5 is in a horizontal position; the method of measuring the maximum magnetic intensity point of the steel plate 5 by the magnetic probe 701 of the magnetometer 7 has the highest detection accuracy when the steel plate 5 is in any position in space.

[0022] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A positioning device for marking the front and back surfaces of a steel plate, characterized in that: The invention comprises a shell (1) and a permanent magnet (3), wherein the shell (1) is made of non-magnetic material and has a receiving cavity inside, wherein two opposite sides of the shell (1) are provided with conical electrical soft iron (2), wherein the permanent magnet (3) is rotatably arranged in the receiving cavity, and a magnetic switch is rotatably connected to an outer wall of one side of the shell (1), wherein the magnetic switch is fixedly connected to the permanent magnet (3) via a rotating shaft, thereby driving the permanent magnet (3) to rotate in the receiving cavity.

2. A positioning device for marking the front and back surfaces of a steel plate according to claim 1, characterized in that: A cross positioning line (4) is provided on the surface of the housing (1) near each of the conical electrical soft irons (2), and each of the conical electrical soft irons (2) is located at the intersection of the cross positioning lines (4).

3. A positioning device for marking the front and back surfaces of a steel plate according to claim 2, characterized in that: Each of the conical electrical soft irons (2) comprises a large end and a small end, wherein the large end is located on the cavity wall of the accommodating cavity, and the small end is located at the center point of the surface of the housing (1).

4. A positioning device for marking the front and back surfaces of a steel plate according to claim 1, characterized in that: The connecting line between the two conical electrical soft irons (2) is located in a plane formed by the rotation of the permanent magnet (3).

5. The positioning device for marking the front and back surfaces of a steel plate according to claim 1, characterized in that: The housing (1) is made of copper material.

6. The positioning device for marking the front and back surfaces of a steel plate according to claim 1, characterized in that: The housing (1) is in the shape of a right prism.

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